document.write( "Question 121175: ALLEN BOUGHT 20 STAMPS IN 37 CENT AND 20 CENT DENOMONATIONS. IF THE TOTAL COST OF THE STAMPS WAS $7.06, HOW MANY 37 CENT STAMPS DID ALLEN BUY \n" ); document.write( "
Algebra.Com's Answer #88904 by checkley71(8403)![]() ![]() ![]() You can put this solution on YOUR website! X+Y=20 OR X=20-Y \n" ); document.write( ".37X+.20Y=7.06 \n" ); document.write( "NOW REPLACE X WITH(20-Y)AND SOLVE FOR Y IN THE SECOND EQUATION \n" ); document.write( ".37(20-Y)+20Y=7.06 \n" ); document.write( "7.40-37Y+20Y=7.06 \n" ); document.write( "-17Y=7.40-7.06 \n" ); document.write( "-17Y=-.34 \n" ); document.write( "Y=-34/-17 \n" ); document.write( "Y=2 $.20 STAMPS. \n" ); document.write( "20-2=18 $.37 STAMPS. \n" ); document.write( "PROOF \n" ); document.write( ".37*18+2*.20=7.06 \n" ); document.write( "6.66+.40=7.06 \n" ); document.write( "7.06=7.06\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |